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Advent calendar 2015
14 December
All 2015 advent puzzles
~
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What is the only palindromic three digit prime number which is also palindromic when written in binary?
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313
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numbers
,
prime numbers
,
palindromes
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Archive
Show me a random puzzle
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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
doubling
logic
circles
integers
balancing
range
averages
odd numbers
surds
cryptic clues
tangents
consecutive numbers
matrices
functions
pentagons
coordinates
ave
palindromes
graphs
geometric mean
consecutive integers
gerrymandering
books
determinants
parabolas
shapes
chalkdust crossnumber
sets
area
division
3d shapes
fractions
crosswords
mean
triangles
bases
albgebra
tournaments
geometric means
speed
floors
scales
sums
regular shapes
square roots
spheres
elections
dodecagons
lines
symmetry
squares
factorials
median
probability
people maths
calculus
christmas
rugby
remainders
triangle numbers
the only crossnumber
polynomials
chocolate
grids
games
arrows
tiling
rectangles
money
binary
decahedra
volume
axes
crossnumbers
digits
sport
pascal's triangle
angles
perfect numbers
digital clocks
colouring
ellipses
numbers
multiplication
coins
means
time
products
digital products
planes
probabilty
shape
multiples
even numbers
star numbers
2d shapes
crossnumber
polygons
prime numbers
dice
trigonometry
sum to infinity
menace
addition
dominos
algebra
quadratics
hexagons
routes
taxicab geometry
complex numbers
folding tube maps
indices
cubics
clocks
square numbers
number
percentages
sequences
wordplay
expansions
geometry
chess
partitions
advent
combinatorics
perimeter
integration
quadrilaterals
unit fractions
differentiation
cube numbers
cryptic crossnumbers
dates
factors
proportion
cards
irreducible numbers
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